Waterproofed material



Nov. w, i942. H. c. KOH 2,301,215

WATERPROOFED MATERIAL original Filed nec. 18S, 19:59

:Illmnllllmllllllllml Patented Nov. l0, 1942 WATERPROOFED MATERIAL Henry C. Koch, Chicago, Ill., assignor to Abbott Coburn, Chicago, Ill.

orig-mai application necember 1s, 1939, serial No.

309,896. Divided and this application February 15, 1941, serial No. 379,118

6 Claims.

My invention relates generally to waterproofed material oi' fibrous character and provided, more especially, in the form of boards, blocks, or the like; and more especially, though not exclusively, to waterproofed boards of fibrous insulating material for use particularly as siding for buildings more commonly provided on the surfaces thereof which are exposed to the weather, with a grit coating adhered thereto, the present application being a division oi.' my pending application for United States Letters Patent Serial No. 309,896, filed December 18, 1939.

Usually in the production of such siding the base boards, which are formed of a wide variety of fibrous materials,- such as for example wood fibers, straw fibers, or bagasse, or a mixture of certain of these fibers or a mixture composed of these fibers and other fibrous material, compressed into board form, such a base board, by way of example, being that known as Insulite," are subjected to an operation whereby they become more or less completely impregnated throughout all of their surfaces with a hot waterproofing fluid, ofsuch character that vit penetrates into the boards and upon cooling to atmospheric temperature becomes hard, forming hard layers in all of the outer portions of the boards composed of the solidified impregnating fluid and the fibers penetrated and incased thereby, with the outer faces of the boards exposing their original texture; 'such as for example an asphalt compound as commonly provided for this purpose.

Such boards, as will be manifest, to be satisfactory in use, must not only present satisfactory protection against weather, but also protection against access of moisture thereto through their inner faces, namely, those faces which are at the inner side of the wall; it being my primary object to provide such an article having theseproperties which shall be much less expensivethan such articles as hitherto provided. v

In the case of grit coated boards, the impregnated board is commonly provided with an asphalt coating to which the surfacing grit, is adhered. This coating has waterproofing qualities to such degree that the layer of impregnating material withinthe body of the board at the surface tov which the coating is applied, need not be as thick as such layer required at the opposite, inner face of the board for protecting the board against access of moisture thereto through its inner surface. Therefore impregnation of the board to the same depth at opposite face portions a board which is not adequately protected against access of moisture at its inner face, or, if such full protection 'is afforded, a board which has a greater thickness of impregnating layer at its outer face than is necessary, thus greatly enhancing the cost of the board.

In accordance with my invention I provide waterproofing impregnating layers in the opposite face portions of the board of such relative thicknesses that the board will afford the desired protective purpose against the weather at its outer face and against access of moisture to its inner face without objectionable excess of impregnating material at its outer face.

Referring to the accompanying drawing:

Figure y1 is a perspective view of a building siding panel embodying my invention.

Figure 2 is a transverse broken section therethrough, the section being taken at the line 2 on Fig. 1 and viewed in the direction of the arrow;

v and mon practice, as to form ship-lap joints with of the board results either in the production of similar boards grouped with it in applying the board to use.

The board shown has hard waterproof layers in its upper and lower. face portions and in its edge portions, as represented at i, 5 and 6, respectively, formed of Waterproofing saturating material, such as for example of the character above referred to. The layers v4, yii and 6 surround and wholly envelop the central core portion I of the board, the layer il of waterproofing material in the upper portion of the board, namely, the portion which-in use is at the inner side of the wall, being thicker than in its lower portion, namely, the portion which is at the outside -of the wall and to which the grit would be applied; the layer 4 being shown as considerably thicker than the layer 5, these two layers in practice, by'way of example, being 1A; inch and inch, respectively, thick.

'I'he article described may be made in accordance with the method and apparatus forming the subject of my aforesaid application Serial No. 309,896.

Generally stated this method involves the subjection of one face of the board which, by way of example, may be about l/2 inch thick, to

hot waterproofing fluid such as above referred to, as for example by iioating it in a bath of such uid heated, as for example, to about 400 F. thus partially submerging the board, whereby the upper surface of the board extends above the level of the bath; and while maintaining the board in the bath conveying it along the bath and in its continuing movement in the bath causing the board to become covered at its upper surface with the hot waterproofing iiuid, as for example by applying downward pressure against the board to overcome its buoyancy and entirely submerge it in the bath, augmented by spraying some lof the hot waterproofing fluid against the upper surface of the board as it leaves the bath. Following these operations the board is passed between heated squeeze rolls which control the thickness and uniformity of waterproofing material allowed to remain on the board at this stage of the operation. The article is then introduced into a drying oven heated by way of example to from about 350 F. to about 400 F. for driving such of the waterproofing fluid as may remain on the surfaces of the board into the board by the action of heat, preferably leaving exposed the original texture of the face portions of the board.

By this procedure the heat of the hot waterproofing material in which the board is partially submerged, serves to vaporize the moisture in the board, and particularly because of the thinness of the board, quickly drives it out of theboard through its upper surface before the waterproofing material is applied to the upper surface vof the board. Thus the board is in` a condition rendering it highly receptive to the application of waterproofing material to its upper surface to the .'lesired depth, for producing the desired waterprooi'ed layer in its upper portion, rendered impervious to moisture by reason of the fact that foaming or-bubbling of the waterproofing material is avoided as such moisture as would produce this action has preliminarily been expelled from the board as stated.

' As 'will be understood, in carrying out the method the board would, by preference, be maintained partially submerged only for such length of time as necessary to drive out substantially all of the contained moisture, in the board and subjected at its upper surface tothe waterproofing uid for a length of time suicient to ensure in the finished board the desired depth of layer of waterproofing material in its upper portion, it being understood that in these operations the waterproofing material'penetrates the surrounding edge portions of the board as also the bottom portion oi' the board.

hard waterproof layers at the surfaces of the board greatly strengthens the board; and results in the leaving of the core 1. of the original untreated fibrous material: the feature of the provision of the layers 4 and 5 of different thicknesses, and still thick enough to serve their intended purpose, being an important factor in the economical production of the finished board.

The removal of vthe moisture from the board by the procedure as defined herein before applying the waterproofing material to the upper face of the board is of considerable practical importance as the possibility of air being driven from the board by heat through the hot waterproofing material and causing foaming or bubbling of waterproofing material, rendering the interior of the nished board accessible to moisture, is` avoided. As the board is relatively thin the moisture therein is quickly expelled by the heat of the bath in which the board is only partially submergedl which makes for the performance of the impregnating operation at great speed and at the same time avoids the necessity of heating the board before initiating the impregnating operation.

As will be understood, the degree to which the impregnating waterproofing material is caused to penetrate the board would depend on the timing of the waterproofing treatment and the temperature of the bath (the hotter the bath the greater the penetration).

While'I have illustrated and described a particular article embodying my invention I do not wish to be understood as intending to limit the invention thereto as the same may be variously modified and altered without departing from the spirit of my invention.

What I claim as new and desire to secure by Letters Patent, is:

1. As an article of manufacture comprising a board, block, or the like, of fibrous material, for subsequent reception of a weather-resistant and/or ornamental layer, said article at its opposite face portions impregnated with waterproofing material forming waterproof layers therein, the layer in one face portion extending to a greater depth therein than the layer in the other face portion, said less-thickness-layer- The board is totally submerged for such length I of time-as to ensure in the finished board a greater depth of layer of waterproofing material in its upper portion than in its bottom portion,

it havingL been -discovered that, by reason of some action, not known to me, the rate at which the waterproong material penetrates downwardly through the upper portion of the board, following the removal of the moisture therefrom as stated, is much faster than that at which the waterproofing material penetrates upwardly through its bottom portion, and in spite of the fact that the bottom portion of the board is subjected to the action of the waterproofing material for a much longer time than the upper portion of the board, a greater thickness of layer of waterproofing -may be produced in the upper 'portion of the board than in its lower portion.

face for reception of said subsequent layer.

2. As an article of manufacture comprising a board, block, or the like, of fibrous material, for subsequent reception of a Weather-resistant and/or ornamental layer, said article at its opposite face portions uniformly impregnated with waterproofing material lforming uniform thickness waterproof layers therein, the layer in one face portion extending to a greater depth therein than the layer in the other face portion, said less-thickness-layer-face for reception of said subsequent layer.

3. As an article'of manufacture comprising a board, block, or the like, of brous material, for subsequent reception of a weather-resistant e and/or o'rnamental layer, said article at its op- As will 'be understood, the provision of the 7s posite face portions impregnated with waterproofing and indurating material forming hard waterproof layers therein, the layerr in one face portion extending to a greater depth therein than the layer in the other face portion, said less-thickness-layer-face for reception of said subsequent layer.

4. As an article of manufacture comprising a hoard, block, or the like, of fibrous material, for subsequent reception of a weather-resistant and/or ornamental layer, said article at its opposite'face portions uniformly impregnated with waterproofing and indurating material forming uniform thickness hard waterproof layers therein, the layer in one face portion extending to a greater depth therein than the layer in the other face portion, said less-thickness-layer-face for reception of said subsequent layer.

5. As an article of manufacture comprising a board, block, or the like, of brous material, for subsequent reception of a weather-resistant and/or ornamental layer, said article at its opposite face portions and its edge portions impregnated with waterprooing material forming waterproof layers therein, the layer in one face portion extending to a greater depth therein than the layer in the other face portion, said less-thickness-layer-face for reception of said subsequent layer.

6. As an article of manufacture comprising a board,l block, or the like, of fibrous material, for subsequent reception of a weather-resistant and/or ornamentallayer, said article 4at its opposite face portions and its edge portions immaterial forming hard waterproof layers therein, the layer in one face portion extending to a greater depth therein than the layer in the other face portion. said less-thickness-layer-face for reception of said subsequent layer.

HENRY C.'KOCH.

CERTIFICATE CF CORRECTION.

Patent No. 2,501,215. November 1o, isha.'

HENRY C. KOCH.

It is hereby certified that error appears in the printed specification of the above numbered .patent requiring Correction as follows: Page 2, second column, lines hO, 50, 6l and "(2, end page 5,'first column, line 8, and

and that the said Letters Patent shouldbe read with this Corr-'ection therein that the same may Conform to the record of the case in the Patent Office.

signed and sealed this 29th dey of December, A. D. 19m. l

HenryA Van rsdale'., (Seal) Aoting Commissioner of.Patents. 

